From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- arch/xtensa/lib/Makefile | 11 +++++++++++ 1 file changed, 11 insertions(+) create mode 100644 arch/xtensa/lib/Makefile (limited to 'arch/xtensa/lib/Makefile') diff --git a/arch/xtensa/lib/Makefile b/arch/xtensa/lib/Makefile new file mode 100644 index 000000000..ec0d8d233 --- /dev/null +++ b/arch/xtensa/lib/Makefile @@ -0,0 +1,11 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Makefile for Xtensa-specific library files. +# + +lib-y += memcopy.o memset.o checksum.o \ + ashldi3.o ashrdi3.o bswapdi2.o bswapsi2.o lshrdi3.o \ + divsi3.o udivsi3.o modsi3.o umodsi3.o mulsi3.o umulsidi3.o \ + usercopy.o strnlen_user.o +lib-$(CONFIG_ARCH_HAS_STRNCPY_FROM_USER) += strncpy_user.o +lib-$(CONFIG_PCI) += pci-auto.o -- cgit v1.3.1